VAT
The VAT page shows the client's VAT position, how much VAT they have charged on sales, how much they have paid on purchases, and what the net position is for any selected period. All data comes from the AADE myDATA API using the client's stored credentials.
What you see
The page is arranged vertically:
Header — page title ("VAT"), subtitle ("VAT position and trend analysis"), and date range picker
Three KPI cards — Output VAT, Input VAT, and Net VAT Position
VAT Position Over Time chart — monthly output VAT, input VAT, and net position shown together
VAT information panel — a callout explaining how the figures are sourced and calculated
Understanding VAT in this context
The VAT figures shown here are derived from the invoices recorded in myDATA:
Output VAT is the VAT the client charges on invoices they issue to customers. The client collects this on behalf of the tax authority.
Input VAT is the VAT the client pays on invoices they receive from suppliers. This is the VAT they have already paid out.
Net VAT Position is Output VAT minus Input VAT — the amount the client owes to, or is owed by, the tax authority.
KPI cards
Output VAT
What it shows: The total VAT collected on all invoices the client issued in the selected period.
How it is calculated:
Sum of all VAT amounts on issued invoices, using myDATA VAT codes 301–329.
Displayed as: Euro amount (€).
Plain terms: This is the VAT the client has charged to their customers. It is collected on behalf of the Greek tax authority and must be declared and paid over.
Input VAT
What it shows: The total VAT paid on all invoices the client received from suppliers in the selected period.
How it is calculated:
Sum of all VAT amounts on received invoices, using myDATA VAT codes 331–399.
Displayed as: Euro amount (€).
Plain terms: This is the VAT the client has already paid out to their suppliers. It can be offset against Output VAT when calculating what is owed to the tax authority.
Net VAT Position (hero card)
What it shows: The net VAT the client owes to (or is owed by) the tax authority for the selected period.
How it is calculated:
Output VAT − Input VAT
Displayed as: Euro amount (€), positive or negative.
Interpreting the result:
Positive (€ > 0)
The client collected more VAT than they paid. This amount is owed to the tax authority.
Negative (€ < 0)
The client paid more VAT than they collected. This is a VAT credit — it can be carried forward to offset future VAT obligations or, in some cases, reclaimed as a refund.
Zero
Output and Input VAT are exactly equal for the period.
Example: Output VAT of €4,200 and Input VAT of €1,800 gives a Net VAT Position of +€2,400 — meaning €2,400 is owed to AADE.
VAT Position Over Time chart
The chart shows three series plotted by month:
Output VAT
Blue
VAT charged on sales each month
Input VAT
Green
VAT paid on purchases each month
Net VAT Position
Orange line
Output minus Input for each month
The blue and green bars show the volume of each VAT type. The orange line shows the resulting net position. Months where the orange line dips below zero indicate a VAT credit position for that month.
The chart updates instantly when you change the date range.
VAT information panel
The panel below the chart provides important context:
"Output VAT and Input VAT values are derived from documents classified via the AADE myDATA platform. Net VAT is calculated as Output – Input. Any discrepancies between myDATA and your accounting records are flagged on the Status page."
This is a reminder that the figures shown here reflect what has been reported to or retrieved from myDATA. They may not match your accounting software if documents have been manually adjusted, are pending classification, or have not yet been submitted to myDATA.
Detail drawer
Clicking any KPI card opens the detail drawer. See Using the detail drawer for a full explanation of the controls.
The drawer for each card shows a definition of the metric and the calculated values by month:
Metric | Definition shown in drawer |
|---|---|
Output VAT | "VAT collected on sales invoices. Source: myDATA." |
Input VAT | "VAT paid on purchases and expenses. Source: myDATA." |
Net VAT Position | "Output VAT minus Input VAT. Positive means VAT payable to tax authority." |
Suggested AI questions
When you open Ask AI from a VAT metric, the following suggested questions are shown:
Output VAT
- "What is Output VAT?"
- "Why did my Output VAT change?"
- "When do I need to pay Output VAT?"
Input VAT
- "What is Input VAT?"
- "Can I reclaim my Input VAT?"
- "Why is my Input VAT high?"
Net VAT Position
- "What does a negative net VAT mean?"
- "How often do I file VAT returns?"
- "Can I carry forward a VAT credit?"
Limitations
myDATA as the source of truth The VAT figures here reflect what myDATA has on record. If invoices have not been submitted to myDATA, or if there are classification errors in the documents, the totals may differ from your accounting records. Always reconcile against your official VAT returns before filing.
Period mismatch The date range picker filters by document date. VAT filing periods (monthly or quarterly) may not align exactly with calendar months depending on how the client's reporting is structured.
Troubleshooting
"No myDATA credentials configured for this client." The client record does not have myDATA API credentials saved. An administrator needs to add the AADE User ID and Subscription Key on the client's Finance & Tax tab. See myDATA credentials.
KPI cards show "N/A". There is no VAT data for the selected period in myDATA. Try widening the date range.
The page shows a spinner and never loads. Credentials are being checked. If this persists for more than a few seconds, refresh the page.
The Net VAT Position does not match my VAT return. The figures shown are derived from documents classified in myDATA and may differ from your official accounting records if some invoices are missing, pending, or classified differently. Use the VAT page as a directional tool and reconcile against your official records before filing.
Output VAT is zero but I know invoices were issued. Check that myDATA credentials are correctly configured and that the invoices in question have been reported to myDATA. If the invoices exist in TaxLayer but are classified as "Blocking" or unlinked to this client, they may not be included in the VAT totals.
Updated on: 16/04/2026
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